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rewrite pfree patch (prepare for power points rework)

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CrazyRedMachine 2023-09-17 22:44:42 +02:00
parent 3c72226089
commit f6610a55f1
1 changed files with 32 additions and 24 deletions
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56
popnhax/dllmain.cc
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@ -1822,6 +1822,29 @@ static bool force_show_details_result() {
return true;
}
uint8_t g_pfree_song_offset = 0x54;
uint16_t g_pfree_song_offset_2 = 0x558;
/* hook is installed in stage increment function */
void (*real_pfree_cleanup)();
void hook_pfree_cleanup()
{
__asm("push esi\n");
__asm("push edi\n");
__asm("push eax\n");
__asm("push ebx\n");
__asm("movsx eax, byte ptr [%0]\n"::"m"(g_pfree_song_offset));
__asm("movsx ebx, word ptr [%0]\n"::"m"(g_pfree_song_offset_2));
__asm("lea edi, dword ptr [esi+eax]\n");
__asm("lea esi, dword ptr [esi+ebx]\n");
__asm("mov ecx, 0x98");
__asm("rep movsd");
__asm("pop ebx");
__asm("pop eax");
__asm("pop edi");
__asm("pop esi");
__asm("ret");
}
static bool patch_pfree() {
DWORD dllSize = 0;
char *data = getDllData(g_game_dll_fn, &dllSize);
@ -1891,38 +1914,23 @@ static bool patch_pfree() {
}
pfree_apply:
int64_t first_loc = 0;
/* cleanup score and stats part1 */
{
first_loc = search(data, dllSize, "\xFE\x46\x0E\x80", 4, 0);
if (first_loc == -1) {
LOG("popnhax: pfree: cannot find stage update function\n");
return false;
}
g_pfree_song_offset = offset_from_base;
g_pfree_song_offset_2 = *((uint16_t*)offset_from_stage1);
g_pfree_song_offset_2 += offset_from_base;
uint64_t patch_addr = (int64_t)data + first_loc;
patch_memory(patch_addr, (char *)"\x90\x90\x90", 3);
}
/* cleanup score and stats part2 */
/* cleanup score and stats */
{
int64_t pattern_offset = search(data, 0x40, "\x83\xC4\x08\x8A", 4, first_loc);
int64_t pattern_offset = search(data, dllSize, "\xFE\x46\x0E\x80", 4, 0);
if (pattern_offset == -1) {
LOG("popnhax: pfree: cannot find stage update function\n");
return false;
}
char patch_str[24] = "\x56\x57\x8D\x7E\x54\x8D\xB6\x58\x05\x00\x00\xB9\x98\x00\x00\x00\xF3\xA5\x5F\x5E\xC3\xCC\xCC";
patch_str[4] = offset_from_base;
patch_str[7] = offset_from_stage1[0] + offset_from_base;
patch_str[8] = offset_from_stage1[1];
uint64_t patch_addr = (int64_t)data + pattern_offset + 0x03;
add_stage_addr = (int64_t)data + pattern_offset + 0x03;
patch_memory(patch_addr, patch_str, 23);
uint64_t patch_addr = (int64_t)data + pattern_offset;
/* replace stage number increment with a score cleanup function */
MH_CreateHook((LPVOID)patch_addr, (LPVOID)hook_pfree_cleanup,
(void **)&real_pfree_cleanup);
}
LOG("popnhax: premium free enabled\n");